Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 1 | /* |
| 2 | * NVEC: NVIDIA compliant embedded controller interface |
| 3 | * |
| 4 | * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.lauchpad.net> |
| 5 | * |
| 6 | * Authors: Pierre-Hugues Husson <phhusson@free.fr> |
| 7 | * Ilya Petrov <ilya.muromec@gmail.com> |
| 8 | * Marc Dietrich <marvin24@gmx.de> |
Julian Andres Klode | 791c4a6 | 2011-09-27 19:00:53 +0200 | [diff] [blame] | 9 | * Julian Andres Klode <jak@jak-linux.org> |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 10 | * |
| 11 | * This file is subject to the terms and conditions of the GNU General Public |
| 12 | * License. See the file "COPYING" in the main directory of this archive |
| 13 | * for more details. |
| 14 | * |
| 15 | */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 16 | |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 17 | /* #define DEBUG */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 18 | |
Julian Andres Klode | 12b5a55 | 2011-09-27 19:01:06 +0200 | [diff] [blame] | 19 | #include <linux/kernel.h> |
Marc Dietrich | 3b769ed | 2011-10-10 11:35:45 +0200 | [diff] [blame] | 20 | #include <linux/module.h> |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 21 | #include <linux/atomic.h> |
Julian Andres Klode | 12b5a55 | 2011-09-27 19:01:06 +0200 | [diff] [blame] | 22 | #include <linux/clk.h> |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 23 | #include <linux/completion.h> |
Julian Andres Klode | 12b5a55 | 2011-09-27 19:01:06 +0200 | [diff] [blame] | 24 | #include <linux/delay.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/gpio.h> |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 27 | #include <linux/interrupt.h> |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 28 | #include <linux/io.h> |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 29 | #include <linux/irq.h> |
Marc Dietrich | 7990b0d | 2011-11-01 21:37:04 +0100 | [diff] [blame] | 30 | #include <linux/of.h> |
| 31 | #include <linux/of_gpio.h> |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 32 | #include <linux/list.h> |
Julian Andres Klode | 12b5a55 | 2011-09-27 19:01:06 +0200 | [diff] [blame] | 33 | #include <linux/mfd/core.h> |
| 34 | #include <linux/mutex.h> |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 35 | #include <linux/notifier.h> |
Julian Andres Klode | 12b5a55 | 2011-09-27 19:01:06 +0200 | [diff] [blame] | 36 | #include <linux/slab.h> |
| 37 | #include <linux/spinlock.h> |
| 38 | #include <linux/workqueue.h> |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 39 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 40 | #include "nvec.h" |
| 41 | |
Julian Andres Klode | 391d2fa | 2011-09-27 19:00:57 +0200 | [diff] [blame] | 42 | #define I2C_CNFG 0x00 |
Burcin Akalin | b4129f2 | 2015-10-30 02:49:01 +0300 | [diff] [blame] | 43 | #define I2C_CNFG_PACKET_MODE_EN (1 << 10) |
| 44 | #define I2C_CNFG_NEW_MASTER_SFM (1 << 11) |
Julian Andres Klode | 391d2fa | 2011-09-27 19:00:57 +0200 | [diff] [blame] | 45 | #define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12 |
| 46 | |
| 47 | #define I2C_SL_CNFG 0x20 |
Burcin Akalin | b4129f2 | 2015-10-30 02:49:01 +0300 | [diff] [blame] | 48 | #define I2C_SL_NEWSL (1 << 2) |
| 49 | #define I2C_SL_NACK (1 << 1) |
| 50 | #define I2C_SL_RESP (1 << 0) |
| 51 | #define I2C_SL_IRQ (1 << 3) |
| 52 | #define END_TRANS (1 << 4) |
| 53 | #define RCVD (1 << 2) |
| 54 | #define RNW (1 << 1) |
Julian Andres Klode | 391d2fa | 2011-09-27 19:00:57 +0200 | [diff] [blame] | 55 | |
| 56 | #define I2C_SL_RCVD 0x24 |
| 57 | #define I2C_SL_STATUS 0x28 |
| 58 | #define I2C_SL_ADDR1 0x2c |
| 59 | #define I2C_SL_ADDR2 0x30 |
| 60 | #define I2C_SL_DELAY_COUNT 0x3c |
| 61 | |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 62 | /** |
| 63 | * enum nvec_msg_category - Message categories for nvec_msg_alloc() |
| 64 | * @NVEC_MSG_RX: The message is an incoming message (from EC) |
| 65 | * @NVEC_MSG_TX: The message is an outgoing message (to EC) |
| 66 | */ |
| 67 | enum nvec_msg_category { |
| 68 | NVEC_MSG_RX, |
| 69 | NVEC_MSG_TX, |
| 70 | }; |
| 71 | |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 72 | enum nvec_sleep_subcmds { |
| 73 | GLOBAL_EVENTS, |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 74 | AP_PWR_DOWN, |
| 75 | AP_SUSPEND, |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 76 | }; |
| 77 | |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 78 | #define CNF_EVENT_REPORTING 0x01 |
| 79 | #define GET_FIRMWARE_VERSION 0x15 |
| 80 | #define LID_SWITCH BIT(1) |
| 81 | #define PWR_BUTTON BIT(15) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 82 | |
| 83 | static struct nvec_chip *nvec_power_handle; |
| 84 | |
Geert Uytterhoeven | 28397dc | 2013-11-18 14:33:05 +0100 | [diff] [blame] | 85 | static const struct mfd_cell nvec_devices[] = { |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 86 | { |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 87 | .name = "nvec-kbd", |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 88 | }, |
| 89 | { |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 90 | .name = "nvec-mouse", |
Marc Dietrich | 3ec6988 | 2015-01-20 23:01:28 +0100 | [diff] [blame] | 91 | }, |
| 92 | { |
| 93 | .name = "nvec-power", |
| 94 | .id = 0, |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 95 | }, |
| 96 | { |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 97 | .name = "nvec-power", |
| 98 | .id = 1, |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 99 | }, |
| 100 | { |
Marc Dietrich | ac56268 | 2012-06-24 23:25:20 +0200 | [diff] [blame] | 101 | .name = "nvec-paz00", |
Ilya Petrov | 97cc265 | 2011-09-27 19:00:44 +0200 | [diff] [blame] | 102 | }, |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 103 | }; |
| 104 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 105 | /** |
| 106 | * nvec_register_notifier - Register a notifier with nvec |
| 107 | * @nvec: A &struct nvec_chip |
| 108 | * @nb: The notifier block to register |
| 109 | * |
| 110 | * Registers a notifier with @nvec. The notifier will be added to an atomic |
| 111 | * notifier chain that is called for all received messages except those that |
| 112 | * correspond to a request initiated by nvec_write_sync(). |
| 113 | */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 114 | int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb, |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 115 | unsigned int events) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 116 | { |
| 117 | return atomic_notifier_chain_register(&nvec->notifier_list, nb); |
| 118 | } |
| 119 | EXPORT_SYMBOL_GPL(nvec_register_notifier); |
| 120 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 121 | /** |
Marc Dietrich | 111c158 | 2013-04-29 23:14:51 +0200 | [diff] [blame] | 122 | * nvec_unregister_notifier - Unregister a notifier with nvec |
| 123 | * @nvec: A &struct nvec_chip |
| 124 | * @nb: The notifier block to unregister |
| 125 | * |
| 126 | * Unregisters a notifier with @nvec. The notifier will be removed from the |
| 127 | * atomic notifier chain. |
| 128 | */ |
| 129 | int nvec_unregister_notifier(struct nvec_chip *nvec, struct notifier_block *nb) |
| 130 | { |
| 131 | return atomic_notifier_chain_unregister(&nvec->notifier_list, nb); |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(nvec_unregister_notifier); |
| 134 | |
| 135 | /** |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 136 | * nvec_status_notifier - The final notifier |
| 137 | * |
| 138 | * Prints a message about control events not handled in the notifier |
| 139 | * chain. |
| 140 | */ |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 141 | static int nvec_status_notifier(struct notifier_block *nb, |
| 142 | unsigned long event_type, void *data) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 143 | { |
Marc Dietrich | 50d4656 | 2012-06-24 23:25:17 +0200 | [diff] [blame] | 144 | struct nvec_chip *nvec = container_of(nb, struct nvec_chip, |
| 145 | nvec_status_notifier); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 146 | unsigned char *msg = (unsigned char *)data; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 147 | |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 148 | if (event_type != NVEC_CNTL) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 149 | return NOTIFY_DONE; |
| 150 | |
Marc Dietrich | 50d4656 | 2012-06-24 23:25:17 +0200 | [diff] [blame] | 151 | dev_warn(nvec->dev, "unhandled msg type %ld\n", event_type); |
Marc Dietrich | a3a9aa1 | 2011-09-27 19:00:41 +0200 | [diff] [blame] | 152 | print_hex_dump(KERN_WARNING, "payload: ", DUMP_PREFIX_NONE, 16, 1, |
| 153 | msg, msg[1] + 2, true); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 154 | |
| 155 | return NOTIFY_OK; |
| 156 | } |
| 157 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 158 | /** |
| 159 | * nvec_msg_alloc: |
| 160 | * @nvec: A &struct nvec_chip |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 161 | * @category: Pool category, see &enum nvec_msg_category |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 162 | * |
| 163 | * Allocate a single &struct nvec_msg object from the message pool of |
| 164 | * @nvec. The result shall be passed to nvec_msg_free() if no longer |
| 165 | * used. |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 166 | * |
| 167 | * Outgoing messages are placed in the upper 75% of the pool, keeping the |
| 168 | * lower 25% available for RX buffers only. The reason is to prevent a |
| 169 | * situation where all buffers are full and a message is thus endlessly |
| 170 | * retried because the response could never be processed. |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 171 | */ |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 172 | static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec, |
| 173 | enum nvec_msg_category category) |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 174 | { |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 175 | int i = (category == NVEC_MSG_TX) ? (NVEC_POOL_SIZE / 4) : 0; |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 176 | |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 177 | for (; i < NVEC_POOL_SIZE; i++) { |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 178 | if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { |
| 179 | dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); |
| 180 | return &nvec->msg_pool[i]; |
| 181 | } |
| 182 | } |
| 183 | |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 184 | dev_err(nvec->dev, "could not allocate %s buffer\n", |
| 185 | (category == NVEC_MSG_TX) ? "TX" : "RX"); |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 186 | |
| 187 | return NULL; |
| 188 | } |
| 189 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 190 | /** |
| 191 | * nvec_msg_free: |
| 192 | * @nvec: A &struct nvec_chip |
| 193 | * @msg: A message (must be allocated by nvec_msg_alloc() and belong to @nvec) |
| 194 | * |
| 195 | * Free the given message |
| 196 | */ |
Denis Efremov | 705a421 | 2013-05-09 13:19:37 +0400 | [diff] [blame] | 197 | void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 198 | { |
Julian Andres Klode | 7b77065 | 2011-09-27 19:00:52 +0200 | [diff] [blame] | 199 | if (msg != &nvec->tx_scratch) |
| 200 | dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 201 | atomic_set(&msg->used, 0); |
| 202 | } |
Julian Andres Klode | 198dd26 | 2011-09-27 19:00:58 +0200 | [diff] [blame] | 203 | EXPORT_SYMBOL_GPL(nvec_msg_free); |
Julian Andres Klode | 0b1076c | 2011-09-27 19:00:48 +0200 | [diff] [blame] | 204 | |
Julian Andres Klode | 8517e87 | 2011-09-27 19:00:50 +0200 | [diff] [blame] | 205 | /** |
| 206 | * nvec_msg_is_event - Return %true if @msg is an event |
| 207 | * @msg: A message |
| 208 | */ |
| 209 | static bool nvec_msg_is_event(struct nvec_msg *msg) |
| 210 | { |
| 211 | return msg->data[0] >> 7; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * nvec_msg_size - Get the size of a message |
| 216 | * @msg: The message to get the size for |
| 217 | * |
| 218 | * This only works for received messages, not for outgoing messages. |
| 219 | */ |
| 220 | static size_t nvec_msg_size(struct nvec_msg *msg) |
| 221 | { |
| 222 | bool is_event = nvec_msg_is_event(msg); |
| 223 | int event_length = (msg->data[0] & 0x60) >> 5; |
| 224 | |
| 225 | /* for variable size, payload size in byte 1 + count (1) + cmd (1) */ |
| 226 | if (!is_event || event_length == NVEC_VAR_SIZE) |
| 227 | return (msg->pos || msg->size) ? (msg->data[1] + 2) : 0; |
| 228 | else if (event_length == NVEC_2BYTES) |
| 229 | return 2; |
| 230 | else if (event_length == NVEC_3BYTES) |
| 231 | return 3; |
Pawel Lebioda | aea2cda | 2014-07-05 22:30:55 +0200 | [diff] [blame] | 232 | return 0; |
Julian Andres Klode | 8517e87 | 2011-09-27 19:00:50 +0200 | [diff] [blame] | 233 | } |
| 234 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 235 | /** |
| 236 | * nvec_gpio_set_value - Set the GPIO value |
| 237 | * @nvec: A &struct nvec_chip |
| 238 | * @value: The value to write (0 or 1) |
| 239 | * |
| 240 | * Like gpio_set_value(), but generating debugging information |
| 241 | */ |
Julian Andres Klode | e7c4085 | 2011-09-27 19:00:49 +0200 | [diff] [blame] | 242 | static void nvec_gpio_set_value(struct nvec_chip *nvec, int value) |
| 243 | { |
| 244 | dev_dbg(nvec->dev, "GPIO changed from %u to %u\n", |
| 245 | gpio_get_value(nvec->gpio), value); |
| 246 | gpio_set_value(nvec->gpio, value); |
| 247 | } |
| 248 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 249 | /** |
| 250 | * nvec_write_async - Asynchronously write a message to NVEC |
| 251 | * @nvec: An nvec_chip instance |
| 252 | * @data: The message data, starting with the request type |
| 253 | * @size: The size of @data |
| 254 | * |
| 255 | * Queue a single message to be transferred to the embedded controller |
| 256 | * and return immediately. |
| 257 | * |
| 258 | * Returns: 0 on success, a negative error code on failure. If a failure |
Gustavo A. R. Silva | 9b872a7 | 2015-01-11 15:49:13 -0600 | [diff] [blame] | 259 | * occurred, the nvec driver may print an error. |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 260 | */ |
Julian Andres Klode | 1b9bf62 | 2011-09-27 19:00:55 +0200 | [diff] [blame] | 261 | int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 262 | short size) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 263 | { |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 264 | struct nvec_msg *msg; |
| 265 | unsigned long flags; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 266 | |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 267 | msg = nvec_msg_alloc(nvec, NVEC_MSG_TX); |
| 268 | |
Julian Andres Klode | 1b9bf62 | 2011-09-27 19:00:55 +0200 | [diff] [blame] | 269 | if (msg == NULL) |
| 270 | return -ENOMEM; |
| 271 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 272 | msg->data[0] = size; |
| 273 | memcpy(msg->data + 1, data, size); |
| 274 | msg->size = size + 1; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 275 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 276 | spin_lock_irqsave(&nvec->tx_lock, flags); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 277 | list_add_tail(&msg->node, &nvec->tx_data); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 278 | spin_unlock_irqrestore(&nvec->tx_lock, flags); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 279 | |
Linus Torvalds | 033d995 | 2012-10-02 09:54:49 -0700 | [diff] [blame] | 280 | schedule_work(&nvec->tx_work); |
Julian Andres Klode | 1b9bf62 | 2011-09-27 19:00:55 +0200 | [diff] [blame] | 281 | |
| 282 | return 0; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 283 | } |
| 284 | EXPORT_SYMBOL(nvec_write_async); |
| 285 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 286 | /** |
| 287 | * nvec_write_sync - Write a message to nvec and read the response |
| 288 | * @nvec: An &struct nvec_chip |
| 289 | * @data: The data to write |
| 290 | * @size: The size of @data |
| 291 | * |
| 292 | * This is similar to nvec_write_async(), but waits for the |
| 293 | * request to be answered before returning. This function |
| 294 | * uses a mutex and can thus not be called from e.g. |
| 295 | * interrupt handlers. |
| 296 | * |
| 297 | * Returns: A pointer to the response message on success, |
Julian Andres Klode | 198dd26 | 2011-09-27 19:00:58 +0200 | [diff] [blame] | 298 | * %NULL on failure. Free with nvec_msg_free() once no longer |
| 299 | * used. |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 300 | */ |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 301 | struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, |
| 302 | const unsigned char *data, short size) |
| 303 | { |
| 304 | struct nvec_msg *msg; |
| 305 | |
| 306 | mutex_lock(&nvec->sync_write_mutex); |
| 307 | |
| 308 | nvec->sync_write_pending = (data[1] << 8) + data[0]; |
Julian Andres Klode | 1b9bf62 | 2011-09-27 19:00:55 +0200 | [diff] [blame] | 309 | |
Marc Dietrich | 4b8bf03 | 2012-08-19 19:03:07 +0200 | [diff] [blame] | 310 | if (nvec_write_async(nvec, data, size) < 0) { |
| 311 | mutex_unlock(&nvec->sync_write_mutex); |
Julian Andres Klode | 1b9bf62 | 2011-09-27 19:00:55 +0200 | [diff] [blame] | 312 | return NULL; |
Marc Dietrich | 4b8bf03 | 2012-08-19 19:03:07 +0200 | [diff] [blame] | 313 | } |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 314 | |
| 315 | dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", |
| 316 | nvec->sync_write_pending); |
| 317 | if (!(wait_for_completion_timeout(&nvec->sync_write, |
| 318 | msecs_to_jiffies(2000)))) { |
| 319 | dev_warn(nvec->dev, "timeout waiting for sync write to complete\n"); |
| 320 | mutex_unlock(&nvec->sync_write_mutex); |
| 321 | return NULL; |
| 322 | } |
| 323 | |
| 324 | dev_dbg(nvec->dev, "nvec_sync_write: pong!\n"); |
| 325 | |
| 326 | msg = nvec->last_sync_msg; |
| 327 | |
| 328 | mutex_unlock(&nvec->sync_write_mutex); |
| 329 | |
| 330 | return msg; |
| 331 | } |
| 332 | EXPORT_SYMBOL(nvec_write_sync); |
| 333 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 334 | /** |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 335 | * nvec_toggle_global_events - enables or disables global event reporting |
| 336 | * @nvec: nvec handle |
| 337 | * @state: true for enable, false for disable |
| 338 | * |
| 339 | * This switches on/off global event reports by the embedded controller. |
| 340 | */ |
| 341 | static void nvec_toggle_global_events(struct nvec_chip *nvec, bool state) |
| 342 | { |
| 343 | unsigned char global_events[] = { NVEC_SLEEP, GLOBAL_EVENTS, state }; |
| 344 | |
| 345 | nvec_write_async(nvec, global_events, 3); |
| 346 | } |
| 347 | |
| 348 | /** |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 349 | * nvec_event_mask - fill the command string with event bitfield |
| 350 | * ev: points to event command string |
| 351 | * mask: bit to insert into the event mask |
| 352 | * |
| 353 | * Configure event command expects a 32 bit bitfield which describes |
| 354 | * which events to enable. The bitfield has the following structure |
| 355 | * (from highest byte to lowest): |
| 356 | * system state bits 7-0 |
| 357 | * system state bits 15-8 |
| 358 | * oem system state bits 7-0 |
| 359 | * oem system state bits 15-8 |
| 360 | */ |
| 361 | static void nvec_event_mask(char *ev, u32 mask) |
| 362 | { |
Wei Yongjun | 815fb01 | 2013-03-16 22:51:25 +0800 | [diff] [blame] | 363 | ev[3] = mask >> 16 & 0xff; |
| 364 | ev[4] = mask >> 24 & 0xff; |
| 365 | ev[5] = mask >> 0 & 0xff; |
| 366 | ev[6] = mask >> 8 & 0xff; |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /** |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 370 | * nvec_request_master - Process outgoing messages |
| 371 | * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) |
| 372 | * |
| 373 | * Processes all outgoing requests by sending the request and awaiting the |
| 374 | * response, then continuing with the next request. Once a request has a |
| 375 | * matching response, it will be freed and removed from the list. |
| 376 | */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 377 | static void nvec_request_master(struct work_struct *work) |
| 378 | { |
| 379 | struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 380 | unsigned long flags; |
| 381 | long err; |
| 382 | struct nvec_msg *msg; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 383 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 384 | spin_lock_irqsave(&nvec->tx_lock, flags); |
| 385 | while (!list_empty(&nvec->tx_data)) { |
| 386 | msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node); |
| 387 | spin_unlock_irqrestore(&nvec->tx_lock, flags); |
| 388 | nvec_gpio_set_value(nvec, 0); |
| 389 | err = wait_for_completion_interruptible_timeout( |
| 390 | &nvec->ec_transfer, msecs_to_jiffies(5000)); |
| 391 | |
| 392 | if (err == 0) { |
| 393 | dev_warn(nvec->dev, "timeout waiting for ec transfer\n"); |
| 394 | nvec_gpio_set_value(nvec, 1); |
| 395 | msg->pos = 0; |
| 396 | } |
| 397 | |
| 398 | spin_lock_irqsave(&nvec->tx_lock, flags); |
| 399 | |
| 400 | if (err > 0) { |
| 401 | list_del_init(&msg->node); |
| 402 | nvec_msg_free(nvec, msg); |
| 403 | } |
| 404 | } |
| 405 | spin_unlock_irqrestore(&nvec->tx_lock, flags); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 406 | } |
| 407 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 408 | /** |
| 409 | * parse_msg - Print some information and call the notifiers on an RX message |
| 410 | * @nvec: A &struct nvec_chip |
| 411 | * @msg: A message received by @nvec |
| 412 | * |
| 413 | * Paarse some pieces of the message and then call the chain of notifiers |
| 414 | * registered via nvec_register_notifier. |
| 415 | */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 416 | static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg) |
| 417 | { |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 418 | if ((msg->data[0] & 1 << 7) == 0 && msg->data[3]) { |
Andy Shevchenko | 6a37197 | 2012-08-02 19:05:46 +0300 | [diff] [blame] | 419 | dev_err(nvec->dev, "ec responded %*ph\n", 4, msg->data); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 420 | return -EINVAL; |
| 421 | } |
| 422 | |
Marc Dietrich | a3a9aa1 | 2011-09-27 19:00:41 +0200 | [diff] [blame] | 423 | if ((msg->data[0] >> 7) == 1 && (msg->data[0] & 0x0f) == 5) |
| 424 | print_hex_dump(KERN_WARNING, "ec system event ", |
| 425 | DUMP_PREFIX_NONE, 16, 1, msg->data, |
| 426 | msg->data[1] + 2, true); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 427 | |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 428 | atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, |
| 429 | msg->data); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 434 | /** |
| 435 | * nvec_dispatch - Process messages received from the EC |
| 436 | * @work: A &struct work_struct (the tx_worker member of &struct nvec_chip) |
| 437 | * |
| 438 | * Process messages previously received from the EC and put into the RX |
| 439 | * queue of the &struct nvec_chip instance associated with @work. |
| 440 | */ |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 441 | static void nvec_dispatch(struct work_struct *work) |
| 442 | { |
| 443 | struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 444 | unsigned long flags; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 445 | struct nvec_msg *msg; |
| 446 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 447 | spin_lock_irqsave(&nvec->rx_lock, flags); |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 448 | while (!list_empty(&nvec->rx_data)) { |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 449 | msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node); |
| 450 | list_del_init(&msg->node); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 451 | spin_unlock_irqrestore(&nvec->rx_lock, flags); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 452 | |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 453 | if (nvec->sync_write_pending == |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 454 | (msg->data[2] << 8) + msg->data[0]) { |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 455 | dev_dbg(nvec->dev, "sync write completed!\n"); |
| 456 | nvec->sync_write_pending = 0; |
| 457 | nvec->last_sync_msg = msg; |
| 458 | complete(&nvec->sync_write); |
| 459 | } else { |
| 460 | parse_msg(nvec, msg); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 461 | nvec_msg_free(nvec, msg); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 462 | } |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 463 | spin_lock_irqsave(&nvec->rx_lock, flags); |
| 464 | } |
| 465 | spin_unlock_irqrestore(&nvec->rx_lock, flags); |
| 466 | } |
| 467 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 468 | /** |
| 469 | * nvec_tx_completed - Complete the current transfer |
| 470 | * @nvec: A &struct nvec_chip |
| 471 | * |
| 472 | * This is called when we have received an END_TRANS on a TX transfer. |
| 473 | */ |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 474 | static void nvec_tx_completed(struct nvec_chip *nvec) |
| 475 | { |
| 476 | /* We got an END_TRANS, let's skip this, maybe there's an event */ |
| 477 | if (nvec->tx->pos != nvec->tx->size) { |
| 478 | dev_err(nvec->dev, "premature END_TRANS, resending\n"); |
| 479 | nvec->tx->pos = 0; |
| 480 | nvec_gpio_set_value(nvec, 0); |
| 481 | } else { |
| 482 | nvec->state = 0; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 483 | } |
| 484 | } |
| 485 | |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 486 | /** |
| 487 | * nvec_rx_completed - Complete the current transfer |
| 488 | * @nvec: A &struct nvec_chip |
| 489 | * |
| 490 | * This is called when we have received an END_TRANS on a RX transfer. |
| 491 | */ |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 492 | static void nvec_rx_completed(struct nvec_chip *nvec) |
| 493 | { |
Julian Andres Klode | 210ceb4 | 2011-09-27 19:01:01 +0200 | [diff] [blame] | 494 | if (nvec->rx->pos != nvec_msg_size(nvec->rx)) { |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 495 | dev_err(nvec->dev, "RX incomplete: Expected %u bytes, got %u\n", |
| 496 | (uint) nvec_msg_size(nvec->rx), |
| 497 | (uint) nvec->rx->pos); |
| 498 | |
Julian Andres Klode | 210ceb4 | 2011-09-27 19:01:01 +0200 | [diff] [blame] | 499 | nvec_msg_free(nvec, nvec->rx); |
| 500 | nvec->state = 0; |
Julian Andres Klode | d6bdcf2 | 2011-09-27 19:01:04 +0200 | [diff] [blame] | 501 | |
| 502 | /* Battery quirk - Often incomplete, and likes to crash */ |
| 503 | if (nvec->rx->data[0] == NVEC_BAT) |
| 504 | complete(&nvec->ec_transfer); |
| 505 | |
Julian Andres Klode | 210ceb4 | 2011-09-27 19:01:01 +0200 | [diff] [blame] | 506 | return; |
| 507 | } |
| 508 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 509 | spin_lock(&nvec->rx_lock); |
| 510 | |
| 511 | /* add the received data to the work list |
| 512 | and move the ring buffer pointer to the next entry */ |
| 513 | list_add_tail(&nvec->rx->node, &nvec->rx_data); |
| 514 | |
| 515 | spin_unlock(&nvec->rx_lock); |
| 516 | |
| 517 | nvec->state = 0; |
| 518 | |
| 519 | if (!nvec_msg_is_event(nvec->rx)) |
| 520 | complete(&nvec->ec_transfer); |
| 521 | |
Linus Torvalds | 033d995 | 2012-10-02 09:54:49 -0700 | [diff] [blame] | 522 | schedule_work(&nvec->rx_work); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | /** |
| 526 | * nvec_invalid_flags - Send an error message about invalid flags and jump |
| 527 | * @nvec: The nvec device |
| 528 | * @status: The status flags |
| 529 | * @reset: Whether we shall jump to state 0. |
| 530 | */ |
| 531 | static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status, |
| 532 | bool reset) |
| 533 | { |
| 534 | dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n", |
| 535 | status, nvec->state); |
| 536 | if (reset) |
| 537 | nvec->state = 0; |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * nvec_tx_set - Set the message to transfer (nvec->tx) |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 542 | * @nvec: A &struct nvec_chip |
| 543 | * |
| 544 | * Gets the first entry from the tx_data list of @nvec and sets the |
| 545 | * tx member to it. If the tx_data list is empty, this uses the |
| 546 | * tx_scratch message to send a no operation message. |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 547 | */ |
| 548 | static void nvec_tx_set(struct nvec_chip *nvec) |
| 549 | { |
| 550 | spin_lock(&nvec->tx_lock); |
| 551 | if (list_empty(&nvec->tx_data)) { |
| 552 | dev_err(nvec->dev, "empty tx - sending no-op\n"); |
| 553 | memcpy(nvec->tx_scratch.data, "\x02\x07\x02", 3); |
| 554 | nvec->tx_scratch.size = 3; |
| 555 | nvec->tx_scratch.pos = 0; |
| 556 | nvec->tx = &nvec->tx_scratch; |
| 557 | list_add_tail(&nvec->tx->node, &nvec->tx_data); |
| 558 | } else { |
| 559 | nvec->tx = list_first_entry(&nvec->tx_data, struct nvec_msg, |
| 560 | node); |
| 561 | nvec->tx->pos = 0; |
| 562 | } |
| 563 | spin_unlock(&nvec->tx_lock); |
| 564 | |
| 565 | dev_dbg(nvec->dev, "Sending message of length %u, command 0x%x\n", |
| 566 | (uint)nvec->tx->size, nvec->tx->data[1]); |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * nvec_interrupt - Interrupt handler |
| 571 | * @irq: The IRQ |
| 572 | * @dev: The nvec device |
Julian Andres Klode | bdf034d | 2011-09-27 19:00:56 +0200 | [diff] [blame] | 573 | * |
| 574 | * Interrupt handler that fills our RX buffers and empties our TX |
| 575 | * buffers. This uses a finite state machine with ridiculous amounts |
| 576 | * of error checking, in order to be fairly reliable. |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 577 | */ |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 578 | static irqreturn_t nvec_interrupt(int irq, void *dev) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 579 | { |
| 580 | unsigned long status; |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 581 | unsigned int received = 0; |
| 582 | unsigned char to_send = 0xff; |
| 583 | const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW; |
| 584 | struct nvec_chip *nvec = dev; |
| 585 | unsigned int state = nvec->state; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 586 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 587 | status = readl(nvec->base + I2C_SL_STATUS); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 588 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 589 | /* Filter out some errors */ |
| 590 | if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) { |
| 591 | dev_err(nvec->dev, "unexpected irq mask %lx\n", status); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 592 | return IRQ_HANDLED; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 593 | } |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 594 | if ((status & I2C_SL_IRQ) == 0) { |
| 595 | dev_err(nvec->dev, "Spurious IRQ\n"); |
| 596 | return IRQ_HANDLED; |
| 597 | } |
| 598 | |
| 599 | /* The EC did not request a read, so it send us something, read it */ |
| 600 | if ((status & RNW) == 0) { |
| 601 | received = readl(nvec->base + I2C_SL_RCVD); |
| 602 | if (status & RCVD) |
| 603 | writel(0, nvec->base + I2C_SL_RCVD); |
| 604 | } |
| 605 | |
| 606 | if (status == (I2C_SL_IRQ | RCVD)) |
| 607 | nvec->state = 0; |
| 608 | |
| 609 | switch (nvec->state) { |
| 610 | case 0: /* Verify that its a transfer start, the rest later */ |
| 611 | if (status != (I2C_SL_IRQ | RCVD)) |
| 612 | nvec_invalid_flags(nvec, status, false); |
| 613 | break; |
| 614 | case 1: /* command byte */ |
| 615 | if (status != I2C_SL_IRQ) { |
| 616 | nvec_invalid_flags(nvec, status, true); |
| 617 | } else { |
Julian Andres Klode | bb0590e | 2011-09-27 19:00:59 +0200 | [diff] [blame] | 618 | nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX); |
Julian Andres Klode | 8da7986 | 2011-09-27 19:01:00 +0200 | [diff] [blame] | 619 | /* Should not happen in a normal world */ |
| 620 | if (unlikely(nvec->rx == NULL)) { |
| 621 | nvec->state = 0; |
| 622 | break; |
| 623 | } |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 624 | nvec->rx->data[0] = received; |
| 625 | nvec->rx->pos = 1; |
| 626 | nvec->state = 2; |
| 627 | } |
| 628 | break; |
| 629 | case 2: /* first byte after command */ |
| 630 | if (status == (I2C_SL_IRQ | RNW | RCVD)) { |
| 631 | udelay(33); |
| 632 | if (nvec->rx->data[0] != 0x01) { |
| 633 | dev_err(nvec->dev, |
| 634 | "Read without prior read command\n"); |
| 635 | nvec->state = 0; |
| 636 | break; |
| 637 | } |
| 638 | nvec_msg_free(nvec, nvec->rx); |
| 639 | nvec->state = 3; |
| 640 | nvec_tx_set(nvec); |
| 641 | BUG_ON(nvec->tx->size < 1); |
| 642 | to_send = nvec->tx->data[0]; |
| 643 | nvec->tx->pos = 1; |
| 644 | } else if (status == (I2C_SL_IRQ)) { |
| 645 | BUG_ON(nvec->rx == NULL); |
| 646 | nvec->rx->data[1] = received; |
| 647 | nvec->rx->pos = 2; |
| 648 | nvec->state = 4; |
| 649 | } else { |
| 650 | nvec_invalid_flags(nvec, status, true); |
| 651 | } |
| 652 | break; |
| 653 | case 3: /* EC does a block read, we transmit data */ |
| 654 | if (status & END_TRANS) { |
| 655 | nvec_tx_completed(nvec); |
| 656 | } else if ((status & RNW) == 0 || (status & RCVD)) { |
| 657 | nvec_invalid_flags(nvec, status, true); |
| 658 | } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) { |
| 659 | to_send = nvec->tx->data[nvec->tx->pos++]; |
| 660 | } else { |
| 661 | dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n", |
| 662 | nvec->tx, |
| 663 | (uint) (nvec->tx ? nvec->tx->pos : 0), |
| 664 | (uint) (nvec->tx ? nvec->tx->size : 0)); |
| 665 | nvec->state = 0; |
| 666 | } |
| 667 | break; |
| 668 | case 4: /* EC does some write, we read the data */ |
| 669 | if ((status & (END_TRANS | RNW)) == END_TRANS) |
| 670 | nvec_rx_completed(nvec); |
| 671 | else if (status & (RNW | RCVD)) |
| 672 | nvec_invalid_flags(nvec, status, true); |
| 673 | else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE) |
| 674 | nvec->rx->data[nvec->rx->pos++] = received; |
| 675 | else |
| 676 | dev_err(nvec->dev, |
Ebru Akagunduz | b77f276 | 2014-03-05 22:48:39 +0200 | [diff] [blame] | 677 | "RX buffer overflow on %p: Trying to write byte %u of %u\n", |
Dan Carpenter | 6330f9c | 2013-11-07 14:25:32 +0300 | [diff] [blame] | 678 | nvec->rx, nvec->rx ? nvec->rx->pos : 0, |
| 679 | NVEC_MSG_SIZE); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 680 | break; |
| 681 | default: |
| 682 | nvec->state = 0; |
| 683 | } |
| 684 | |
| 685 | /* If we are told that a new transfer starts, verify it */ |
| 686 | if ((status & (RCVD | RNW)) == RCVD) { |
| 687 | if (received != nvec->i2c_addr) |
| 688 | dev_err(nvec->dev, |
| 689 | "received address 0x%02x, expected 0x%02x\n", |
| 690 | received, nvec->i2c_addr); |
| 691 | nvec->state = 1; |
| 692 | } |
| 693 | |
| 694 | /* Send data if requested, but not on end of transmission */ |
| 695 | if ((status & (RNW | END_TRANS)) == RNW) |
| 696 | writel(to_send, nvec->base + I2C_SL_RCVD); |
| 697 | |
| 698 | /* If we have send the first byte */ |
| 699 | if (status == (I2C_SL_IRQ | RNW | RCVD)) |
| 700 | nvec_gpio_set_value(nvec, 1); |
| 701 | |
| 702 | dev_dbg(nvec->dev, |
| 703 | "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n", |
| 704 | (status & RNW) == 0 ? "received" : "R=", |
| 705 | received, |
| 706 | (status & (RNW | END_TRANS)) ? "sent" : "S=", |
| 707 | to_send, |
| 708 | state, |
| 709 | status & END_TRANS ? " END_TRANS" : "", |
| 710 | status & RCVD ? " RCVD" : "", |
| 711 | status & RNW ? " RNW" : ""); |
| 712 | |
Julian Andres Klode | de839b8 | 2011-09-27 19:01:07 +0200 | [diff] [blame] | 713 | /* |
| 714 | * TODO: A correct fix needs to be found for this. |
| 715 | * |
| 716 | * We experience less incomplete messages with this delay than without |
| 717 | * it, but we don't know why. Help is appreciated. |
| 718 | */ |
| 719 | udelay(100); |
| 720 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 721 | return IRQ_HANDLED; |
| 722 | } |
| 723 | |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 724 | static void tegra_init_i2c_slave(struct nvec_chip *nvec) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 725 | { |
| 726 | u32 val; |
| 727 | |
Prashant Gaikwad | 61c3b19 | 2012-06-05 09:59:41 +0530 | [diff] [blame] | 728 | clk_prepare_enable(nvec->i2c_clk); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 729 | |
Stephen Warren | c0df5bf | 2013-11-06 16:46:24 -0700 | [diff] [blame] | 730 | reset_control_assert(nvec->rst); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 731 | udelay(2); |
Stephen Warren | c0df5bf | 2013-11-06 16:46:24 -0700 | [diff] [blame] | 732 | reset_control_deassert(nvec->rst); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 733 | |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 734 | val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN | |
| 735 | (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); |
| 736 | writel(val, nvec->base + I2C_CNFG); |
| 737 | |
| 738 | clk_set_rate(nvec->i2c_clk, 8 * 80000); |
| 739 | |
Julian Andres Klode | d3f862a | 2011-12-26 17:57:38 +0100 | [diff] [blame] | 740 | writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG); |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 741 | writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT); |
| 742 | |
Burcin Akalin | a9548c2 | 2015-10-30 03:04:03 +0300 | [diff] [blame] | 743 | writel(nvec->i2c_addr >> 1, nvec->base + I2C_SL_ADDR1); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 744 | writel(0, nvec->base + I2C_SL_ADDR2); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 745 | |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 746 | enable_irq(nvec->irq); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 747 | } |
| 748 | |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 749 | #ifdef CONFIG_PM_SLEEP |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 750 | static void nvec_disable_i2c_slave(struct nvec_chip *nvec) |
| 751 | { |
| 752 | disable_irq(nvec->irq); |
Julian Andres Klode | d3f862a | 2011-12-26 17:57:38 +0100 | [diff] [blame] | 753 | writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG); |
Prashant Gaikwad | 61c3b19 | 2012-06-05 09:59:41 +0530 | [diff] [blame] | 754 | clk_disable_unprepare(nvec->i2c_clk); |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 755 | } |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 756 | #endif |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 757 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 758 | static void nvec_power_off(void) |
| 759 | { |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 760 | char ap_pwr_down[] = { NVEC_SLEEP, AP_PWR_DOWN }; |
| 761 | |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 762 | nvec_toggle_global_events(nvec_power_handle, false); |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 763 | nvec_write_async(nvec_power_handle, ap_pwr_down, 2); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 764 | } |
| 765 | |
Marc Dietrich | 95cd186 | 2013-06-21 10:28:55 +0200 | [diff] [blame] | 766 | /* |
| 767 | * Parse common device tree data |
| 768 | */ |
| 769 | static int nvec_i2c_parse_dt_pdata(struct nvec_chip *nvec) |
| 770 | { |
| 771 | nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0); |
| 772 | |
| 773 | if (nvec->gpio < 0) { |
| 774 | dev_err(nvec->dev, "no gpio specified"); |
| 775 | return -ENODEV; |
| 776 | } |
| 777 | |
| 778 | if (of_property_read_u32(nvec->dev->of_node, "slave-addr", |
| 779 | &nvec->i2c_addr)) { |
| 780 | dev_err(nvec->dev, "no i2c address specified"); |
| 781 | return -ENODEV; |
| 782 | } |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
Bill Pemberton | 4662080 | 2012-11-19 13:22:07 -0500 | [diff] [blame] | 787 | static int tegra_nvec_probe(struct platform_device *pdev) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 788 | { |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 789 | int err, ret; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 790 | struct clk *i2c_clk; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 791 | struct nvec_chip *nvec; |
| 792 | struct nvec_msg *msg; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 793 | struct resource *res; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 794 | void __iomem *base; |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 795 | char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION }, |
| 796 | unmute_speakers[] = { NVEC_OEM0, 0x10, 0x59, 0x95 }, |
| 797 | enable_event[7] = { NVEC_SYS, CNF_EVENT_REPORTING, true }; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 798 | |
Tugce Sirin | 15f1df5 | 2013-10-02 20:04:31 +0300 | [diff] [blame] | 799 | if (!pdev->dev.of_node) { |
Marc Dietrich | 2c6cbdd | 2013-06-21 10:28:54 +0200 | [diff] [blame] | 800 | dev_err(&pdev->dev, "must be instantiated using device tree\n"); |
| 801 | return -ENODEV; |
| 802 | } |
| 803 | |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 804 | nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL); |
Somya Anand | 4c42d97 | 2015-03-16 19:34:11 +0530 | [diff] [blame] | 805 | if (!nvec) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 806 | return -ENOMEM; |
Pawel Lebioda | 5a9077a | 2014-07-05 22:30:56 +0200 | [diff] [blame] | 807 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 808 | platform_set_drvdata(pdev, nvec); |
| 809 | nvec->dev = &pdev->dev; |
Marc Dietrich | 7990b0d | 2011-11-01 21:37:04 +0100 | [diff] [blame] | 810 | |
Marc Dietrich | 95cd186 | 2013-06-21 10:28:55 +0200 | [diff] [blame] | 811 | err = nvec_i2c_parse_dt_pdata(nvec); |
| 812 | if (err < 0) |
| 813 | return err; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 814 | |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 815 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 97f4be60 | 2013-01-21 11:09:19 +0100 | [diff] [blame] | 816 | base = devm_ioremap_resource(&pdev->dev, res); |
| 817 | if (IS_ERR(base)) |
| 818 | return PTR_ERR(base); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 819 | |
Thierry Reding | b5b628b | 2014-07-29 13:16:15 +0200 | [diff] [blame] | 820 | nvec->irq = platform_get_irq(pdev, 0); |
| 821 | if (nvec->irq < 0) { |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 822 | dev_err(&pdev->dev, "no irq resource?\n"); |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 823 | return -ENODEV; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 824 | } |
| 825 | |
Marc Dietrich | c2b62f6 | 2013-04-29 23:14:52 +0200 | [diff] [blame] | 826 | i2c_clk = devm_clk_get(&pdev->dev, "div-clk"); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 827 | if (IS_ERR(i2c_clk)) { |
| 828 | dev_err(nvec->dev, "failed to get controller clock\n"); |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 829 | return -ENODEV; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 830 | } |
| 831 | |
Stephen Warren | c0df5bf | 2013-11-06 16:46:24 -0700 | [diff] [blame] | 832 | nvec->rst = devm_reset_control_get(&pdev->dev, "i2c"); |
| 833 | if (IS_ERR(nvec->rst)) { |
| 834 | dev_err(nvec->dev, "failed to get controller reset\n"); |
| 835 | return PTR_ERR(nvec->rst); |
| 836 | } |
| 837 | |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 838 | nvec->base = base; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 839 | nvec->i2c_clk = i2c_clk; |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 840 | nvec->rx = &nvec->msg_pool[0]; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 841 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 842 | ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list); |
| 843 | |
| 844 | init_completion(&nvec->sync_write); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 845 | init_completion(&nvec->ec_transfer); |
| 846 | mutex_init(&nvec->sync_write_mutex); |
| 847 | spin_lock_init(&nvec->tx_lock); |
| 848 | spin_lock_init(&nvec->rx_lock); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 849 | INIT_LIST_HEAD(&nvec->rx_data); |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 850 | INIT_LIST_HEAD(&nvec->tx_data); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 851 | INIT_WORK(&nvec->rx_work, nvec_dispatch); |
| 852 | INIT_WORK(&nvec->tx_work, nvec_request_master); |
| 853 | |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 854 | err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH, |
| 855 | "nvec gpio"); |
Julian Andres Klode | aed92bb | 2011-12-26 17:57:39 +0100 | [diff] [blame] | 856 | if (err < 0) { |
| 857 | dev_err(nvec->dev, "couldn't request gpio\n"); |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 858 | return -ENODEV; |
Julian Andres Klode | aed92bb | 2011-12-26 17:57:39 +0100 | [diff] [blame] | 859 | } |
| 860 | |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 861 | err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0, |
| 862 | "nvec", nvec); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 863 | if (err) { |
| 864 | dev_err(nvec->dev, "couldn't request irq\n"); |
Marc Dietrich | f5e3352 | 2012-06-24 23:25:16 +0200 | [diff] [blame] | 865 | return -ENODEV; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 866 | } |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 867 | disable_irq(nvec->irq); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 868 | |
| 869 | tegra_init_i2c_slave(nvec); |
| 870 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 871 | /* enable event reporting */ |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 872 | nvec_toggle_global_events(nvec, true); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 873 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 874 | nvec->nvec_status_notifier.notifier_call = nvec_status_notifier; |
| 875 | nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0); |
| 876 | |
| 877 | nvec_power_handle = nvec; |
| 878 | pm_power_off = nvec_power_off; |
| 879 | |
| 880 | /* Get Firmware Version */ |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 881 | msg = nvec_write_sync(nvec, get_firmware_version, 2); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 882 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 883 | if (msg) { |
| 884 | dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n", |
| 885 | msg->data[4], msg->data[5], msg->data[6], msg->data[7]); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 886 | |
Julian Andres Klode | 0cab4cb | 2011-09-27 19:00:51 +0200 | [diff] [blame] | 887 | nvec_msg_free(nvec, msg); |
| 888 | } |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 889 | |
Marc Dietrich | 3ec6988 | 2015-01-20 23:01:28 +0100 | [diff] [blame] | 890 | ret = mfd_add_devices(nvec->dev, 0, nvec_devices, |
Thierry Reding | 47e7b05 | 2014-07-29 13:16:14 +0200 | [diff] [blame] | 891 | ARRAY_SIZE(nvec_devices), NULL, 0, NULL); |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 892 | if (ret) |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 893 | dev_err(nvec->dev, "error adding subdevices\n"); |
| 894 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 895 | /* unmute speakers? */ |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 896 | nvec_write_async(nvec, unmute_speakers, 4); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 897 | |
| 898 | /* enable lid switch event */ |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 899 | nvec_event_mask(enable_event, LID_SWITCH); |
| 900 | nvec_write_async(nvec, enable_event, 7); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 901 | |
| 902 | /* enable power button event */ |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 903 | nvec_event_mask(enable_event, PWR_BUTTON); |
| 904 | nvec_write_async(nvec, enable_event, 7); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 905 | |
| 906 | return 0; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 907 | } |
| 908 | |
Bill Pemberton | 1a6a8a8 | 2012-11-19 13:26:41 -0500 | [diff] [blame] | 909 | static int tegra_nvec_remove(struct platform_device *pdev) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 910 | { |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 911 | struct nvec_chip *nvec = platform_get_drvdata(pdev); |
| 912 | |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 913 | nvec_toggle_global_events(nvec, false); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 914 | mfd_remove_devices(nvec->dev); |
Marc Dietrich | c2b62f6 | 2013-04-29 23:14:52 +0200 | [diff] [blame] | 915 | nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier); |
Tejun Heo | eb1e40a | 2012-08-22 15:32:38 -0700 | [diff] [blame] | 916 | cancel_work_sync(&nvec->rx_work); |
| 917 | cancel_work_sync(&nvec->tx_work); |
Shailendra Verma | fd90ae2 | 2015-05-27 07:00:54 +0530 | [diff] [blame] | 918 | /* FIXME: needs check whether nvec is responsible for power off */ |
Marc Dietrich | c2b62f6 | 2013-04-29 23:14:52 +0200 | [diff] [blame] | 919 | pm_power_off = NULL; |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 920 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 921 | return 0; |
| 922 | } |
| 923 | |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 924 | #ifdef CONFIG_PM_SLEEP |
| 925 | static int nvec_suspend(struct device *dev) |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 926 | { |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 927 | struct platform_device *pdev = to_platform_device(dev); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 928 | struct nvec_chip *nvec = platform_get_drvdata(pdev); |
Marc Dietrich | 9feeb01 | 2011-09-27 19:01:08 +0200 | [diff] [blame] | 929 | struct nvec_msg *msg; |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 930 | char ap_suspend[] = { NVEC_SLEEP, AP_SUSPEND }; |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 931 | |
| 932 | dev_dbg(nvec->dev, "suspending\n"); |
Marc Dietrich | 9feeb01 | 2011-09-27 19:01:08 +0200 | [diff] [blame] | 933 | |
| 934 | /* keep these sync or you'll break suspend */ |
Marc Dietrich | 93eff83 | 2013-01-27 17:43:43 +0100 | [diff] [blame] | 935 | nvec_toggle_global_events(nvec, false); |
| 936 | |
| 937 | msg = nvec_write_sync(nvec, ap_suspend, sizeof(ap_suspend)); |
Marc Dietrich | 9feeb01 | 2011-09-27 19:01:08 +0200 | [diff] [blame] | 938 | nvec_msg_free(nvec, msg); |
| 939 | |
Marc Dietrich | ac81075 | 2011-09-27 19:00:42 +0200 | [diff] [blame] | 940 | nvec_disable_i2c_slave(nvec); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 941 | |
| 942 | return 0; |
| 943 | } |
| 944 | |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 945 | static int nvec_resume(struct device *dev) |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 946 | { |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 947 | struct platform_device *pdev = to_platform_device(dev); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 948 | struct nvec_chip *nvec = platform_get_drvdata(pdev); |
| 949 | |
| 950 | dev_dbg(nvec->dev, "resuming\n"); |
Marc Dietrich | f686e9a | 2011-08-24 20:23:07 +0200 | [diff] [blame] | 951 | tegra_init_i2c_slave(nvec); |
Marc Dietrich | 518945f | 2013-01-27 17:43:41 +0100 | [diff] [blame] | 952 | nvec_toggle_global_events(nvec, true); |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 953 | |
| 954 | return 0; |
| 955 | } |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 956 | #endif |
| 957 | |
Thierry Reding | 5d30566 | 2014-07-21 13:54:41 +0200 | [diff] [blame] | 958 | static SIMPLE_DEV_PM_OPS(nvec_pm_ops, nvec_suspend, nvec_resume); |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 959 | |
Marc Dietrich | 7990b0d | 2011-11-01 21:37:04 +0100 | [diff] [blame] | 960 | /* Match table for of_platform binding */ |
Bill Pemberton | 063f9f6 | 2012-11-19 13:25:26 -0500 | [diff] [blame] | 961 | static const struct of_device_id nvidia_nvec_of_match[] = { |
Marc Dietrich | 7990b0d | 2011-11-01 21:37:04 +0100 | [diff] [blame] | 962 | { .compatible = "nvidia,nvec", }, |
| 963 | {}, |
| 964 | }; |
| 965 | MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match); |
| 966 | |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 967 | static struct platform_driver nvec_device_driver = { |
| 968 | .probe = tegra_nvec_probe, |
Bill Pemberton | 44b90a3 | 2012-11-19 13:20:55 -0500 | [diff] [blame] | 969 | .remove = tegra_nvec_remove, |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 970 | .driver = { |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 971 | .name = "nvec", |
Marc Dietrich | ebefae2 | 2012-06-24 23:25:19 +0200 | [diff] [blame] | 972 | .pm = &nvec_pm_ops, |
Marc Dietrich | 7990b0d | 2011-11-01 21:37:04 +0100 | [diff] [blame] | 973 | .of_match_table = nvidia_nvec_of_match, |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 974 | } |
| 975 | }; |
| 976 | |
Marc Dietrich | 9891b1c | 2012-06-24 23:25:18 +0200 | [diff] [blame] | 977 | module_platform_driver(nvec_device_driver); |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 978 | |
Marc Dietrich | 32890b9 | 2011-05-19 16:34:42 +0200 | [diff] [blame] | 979 | MODULE_ALIAS("platform:nvec"); |
Marc Dietrich | 162c7d8 | 2011-09-27 19:00:40 +0200 | [diff] [blame] | 980 | MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface"); |
| 981 | MODULE_AUTHOR("Marc Dietrich <marvin24@gmx.de>"); |
| 982 | MODULE_LICENSE("GPL"); |